The alien homonid jump has been patched out. All of the times that are on the leaderboards using the glitch are still there, and are basically unbeatable now
The pink knight jump can be done two different ways. Either double jump the frame after you leave the ground, or in other words, double tap jump really fast. This is the way I do it, since I don't like pause buffering.
You can pause buffer the double jump somehow, but I never really looked into doing it.
I find it easiest to super jump using my thumb. It's kind of difficult to explain, but I just do a double tap, rather than two different button presses. It's kind of like a bass thumb slap, but on the X button.